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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>块状元素</title>
</head>
<!-- 可以设置宽高自己独占一行 -->

<body>
    <div style="width: 100px;height: 200px;background-color: blue;"></div>
    哇哇哇哇唯唯诺诺
</body>

</html>